Method of making carry bags



March 17, 1936 w P PPE 2,033,997

METHOD OF MAKING CARRY BAGS I Fi l'ed May 5, 1934 5 Sheets-Sheet l llll.

IIIIIIL IIIIJ INVENTOR fo/Pai 1M Pa 5 ATTORNEY arch 17, 1936. v G. w. POPPE 2,033,997

METHOD OF MAKING CARRY BAGS Filed May 5, 1934 3 Sheets-Sheet 3 INVENTOR 650/?65 M Pop/=5.

ATTORNEY Patented Mar. 17, 1936 UNITED STATES PATENT OFFICE METHOD OF MAKING CARRY BAGS Application May 5, 1934, Serial No. 724,143

6 Claims. (01. 93-35) This invention relates to carry bags and the process of making them.

An object of the invention is the production of a bag of this type by methods adapted for use with ordinary bag machinery without making extensive changes or extensive additions to such ordinary machinery. The carry bags to which my invention relates are provided with a tab or tongue formed either in the bag lip or bag walls which tongue or tab is passed through an opening in the other bag element. Heretofore, as far as I am aware, the forming of such tongues or tabs has resulted in slowing down production either by reason of the necessity for making the machine unduly. complicated or by requiring too many separate operations.

Another object of the invention, therefore, is the production of a carry bag by processes that do not perceptibly slow down the machine. In other words, a carry bag of my invention having a tab designed to be passed through an opening in the bag walls may be produced withpractically the same speed as ordinary bags are pro-' duced.

In my Patent No. 1,895,267, January 24, 1933, I have shown a carry bag in which the walls of the bag are overlapped to form a wide seam and'the tab is cut out of the seam within the paste lines which secure the edges of the seam together. In the construction of such a bag more paper is required than is necessary for the production of the bag of the present invention. Likewise the plies of the tab of the patent are not pasted together.-

A feature of the present invention, therefore, resides in a method of producing a bag in which one edge of ,the overlapped seamis coincident with one edge of the tab. In the method to be described the line of paste which secures the seam passes through the tab so that the two plies of the tab are pasted together.

A further feature of the invention resides in the process by which a tab on the bag lip may be made more conveniently without decreasing the speed of the bag machine.

More detailed features and advantages of the present invention will be apparent from the following description and claims when taken in connection with the accompanying drawings in which:

Figure 1 is a front elevation of a bag section before the bottom is closed, in which the seam is overlapped the width of the tongue or tab; Figure 2 isa similar view of a modification in which-the overlap is somewhat greater than in the Figure 1 construction but in which one edge of the tab is coincident with one edge of the seam;

Figure 3 is a front view of a bag similar to Figure 1 but having. a reenforcing strip in its front wall;

Figure 4 is the bag of Figure 3 with the bottom closed;

Figure 5 illustrates more or less diagrammatically the process by which the bag of Figure 1 is produced;

Figure 6 is a section on the line 6-6, Figu Figure 7 is a diagrammatic view similar to Figure 5 but illustrating the method by which the bag shown in Figure 2 is made;

Figure 8 is a section on the line 8--8, Fige q Figure 9 is a section on the line 9-9, Figure 3; I

Figure 10 is a side elevation of portions of a conventional bag machine on which the bag shownin Figures 1 and 2 may be made; I

Figure 11 is a rear view looking in the direction of the lines ll-l I, Figure 10, showing the dies for making the slits in the web; and

Figure 12 is a diagrammatic view showing a portion of the mechanism at the rear of the machine and illustrating the manner in which the reenforcing strip is associated with the main web from which the bag tube is formed.

Referring to Figure 1, the numeral l indicates the front wall of a bag and 2 indicates the rear wall thereof. The bag is formed with an overlapped seam 3 which is held together by a line of paste 4. 6 is a closing flap for the bag, said flap being a prolongation of the seam wall.

Cut into the edge of the flap 6 is a tab or tongue 8 and in the bag illustrated in this figure the edges l0 and I2 of the tab are coincident with the edges of the seam. In other words, the seam 40 and tab are of the same width. To complete a bag of this type the bottom flap I4 is folded back on to the seam wall, the line of fold being indicated by the dot and dash line H.

' When the flap 6 is folded down on to the front wall I of the bag, the tab 8 is passed through apertures l6 made in the bag wall.

By reason of the tab being of the same width as the flap, the line of paste which secures the edges of the seam passes approximately centrally through the tab and secures the two plies thereof together so that it is thereby somewhat reenforced by the paste. The hole [6 is made in the se m and when the tab 8 is passed through t e apertures I6, the weight of the bag and contents is borne by three thicknesses of paper, two thicknesses in the overlapped seam and one thickness in the upper or front bag wall I. Such a bag requires a minimum amount of paper for its production but nevertheless is sufficiently strong for many uses to which it may be put.

In the Figure 2 construction the seam 3 is overlapped to a greater extent and in addition to the paste line 4 adjacent one edge of the seam there is another paste line 5 adjacent the other edge thereof. The tab 8 has its edge I2 coincident with one edge of the seam but the other edge of the tab is within the seam. The. apertures I6 pass through the walls of the bag as in the Figure 1 construction but the aperture is entirely within one margin of the seam. The bottom of the bag is folded along the line aa as in the Figure 1 construction.

The bag of Figure 2 requires a little more paper than is required in the Figure 1 construction but the wider seam gives slightly greater reenforcement and only one edge of the seam is cut by the aperture I6 in the seam wall.

A still stronger bag is provided by the construction shown in Figure 3. This bag is similar to Figure 1 in that the seam wall of the bag is overlapped to form a narrow seam as indicated at 3 and the tab 8 is of the same width of the seam. However, the front wall of the bag has secured to it a reenforced strip 53, the edges of which are defined by the dotted lines I8 and 29. The opening I6 in the front wall of the bag is wholly within the margins of this strip. The reenforcing strip extends the full length of the front bag wall and isv included within the bottom fold. The reenforcing strip may be pasted near its edges as indicated by the paste lines 22 and 24.

I prefer to produce the tab on the several types of bags heretofore described by a method which includes preliminarily slitting the web of paper at bag length intervals prior to folding the same to form a bag tube from which the individual bags are cut off. In Figure 5 I have shown somewhat diagrammatically some of the elements of an ordinary bag machine which will illustrate how the tab is made. In said figure, 26 represents the reversing roller over which the web of paper passes prior to being folded in the bag tube. 28 represents the former about which the web of paper is wrapped to form the bag tube. As usual, a paste disc 29 mounted in a paste pot 30 applies a line of paste 4 to one edge of the web as it is fed over the roller 26. Some of these parts are better illustrated in Figure 10 which shows more or less diagrammatically a. section through an ordinary bag machine. The web of paper is supplied from a roll 32, the web 34 passing over suitable guide rollers and around the roller 26 which reverses its direction. The web then passes under the former 28 and is folded about it as is customary in bag machines. The folded tube is fed forward by feed rollers 36. At the proper time the tube is retarded by the pinch bars 38 and a striker bar 46 carried by a chain 42 operates to sever the tube against the serrated edge 44 of the former and the serrated edge 45 of the lip knife.

The slits III and I2 which are to form the edges of the tab are cut in the web by dies 46, one of which is suitably supported near each end of a shaft 41 driven by suitable belting indicated at 48, Figures 10 and 11. Each die 46 is spaced from the edge of the web a distance equal to the width desired for the tab 8 which is to be finally formed in the bag flap. The web is fed centrally of the former and after being slit is folded about the former in such a manner ,that the overlapped seam is equal in width to that of the tab. This results in the slit I0 being coincident with the opposite edge of the web and the slit I2 being coincident with the edge adjacent the slit III, as will be apparent from Figures 5 and 6. The turning of the parts is such that the dies 46 make one revolution for each bag length of. web. The feed rollers likewise make one rotation for each bag tube length. Therefore, the slits I0 and I2 are made at bag length intervals apart. The striker bar 40 is so turned with the feed rollers that when the tube is in such a position that the ends of the slits I0 and I2 are in line with the lip knife 45, the striker bar cuts off a bag length. Thus the lip knife 45 severs the bag tube along a line which meets the ends of the slits I0 and I2 as shown at the. left of Figure 5 where the edge of the flap 6 is indicated in dotted lines.

A somewhat similar method is employed for making the bag illustrated in Figure 2 and in Figure 7 this method as applied to an ordinary bag machine is diagrammatically shown. For making a bag of this type, however, a wider web is employed and they web is not run centrally of the former but is offset from the center thereof as clearly indicated in Figure '7.

In making the bag by the method shown in Figure 7, I make the slit I2 spaced from one bag edge a distance equal to the width desired for the tab and at the other bag edge I make two slits I0 and 52, the latter slits being spaced apart a distance equal to the width of the tab. The slit 52 is. near the other bag edge but the distance from said edge would depend, upon the amount of overlap in the seam. I also employ two paste discs 29 and 29', said discs being so situated that one paste line 56 is applied near the edge of the web while the other paste line is applied between the slits I0 and 52. When the web is folded to form a bag tube the slit 52 is superimposed on the slit I2, the slit I6 coinciding with the edge of the web adjacent the slit I2 which becomes one edge of the seam after the folding takes place. This is shown in Figure '7 or perhaps more clearly in Figure 8.

In the methods shown in both Figures 5 and 7 the slits in the web are made at bag length intervals apart and to this end the radius of the cutting edge of the dies 46 is the same as that of the feed rollers 36. Therefore, when the feed rollers revolve once they feed the bag tube the distance of a bag length. When the dies 46 revolve once they make slits bag length intervals apart so that the bag tube is cut at the proper place with the result that the line of severance of the seam wall by the lip knife meets the ends of the slits in both types of bag.

The bag shown in Figure 3 in which a reenforcing strip is formed in the front bag wall may also be made on an ordinary bag machine such as that shown in Figure I0 but slightly modified in order to supply the reenforcing strip and to paste it to the main web. In Figure 12 I have shown so much of the right hand end of the bag machine as will illustrate the method by which the reenforcing strip is fed to the machine. The reenforcing strip 53 is fed from a supply roll 55 and about the roller 26 and on top of the main web 34. Both webs are then fed under the former with the reenforcing strip uppermost and centrally of the main web. An auxiliary pair of paste rollers 56 supply paste to the edges of the reenforcing strip 53 as the same passes about an idler 58 suitably supported in the machine frame. Since that part of the web which passes underneath the former forms the front of the bag, it will be understood from what has been said that the reenforcing strip is secured to the front wall of the bag and extends the full length thereof. In this bag the seam is overlapped only the width of the tab, said tab being preferably formed by the same method of slitting the web as described in connection with making of the bag shown in Figure 1, the method being illustrated in Figure 5.

The slits l and I2 coincide with the edges of the seam as shown in Figure 9.

What I claim is:-

1. The method of producing a tab on a bag flap which consists in making a slit in a web of paper spaced from each edge thereof a distance equal to the width desired for the tab, folding the web to form a tube having a seam whose edge is in line with one edge of the tab, and severing the tube along a line which meets the ends of the slits.

2. The method of producing a tab on a bag fiap which consists in applying a single line of paste adjacent one edge of a web of paper, making a slit in said web spaced from each edge thereof a distance equal to the width desired for the tab, folding the web to form a tube having a seam in line with one of said slits and severing the tube along a line which meets the ends of the slits.

3. The method of producing a tab on a bag fiap which consists in making slits adjacent each edge of a web of paper, said slits being at bag length intervals apart and at a distance from the edge of the web equal to the width desired for the tab,

said slits being of a length equal to the length desired for the tab, folding the web to form a tube having a seam of a width also equal to the width of the tab and severing the tube along a line which meets the ends of successive pairs of slits.

4. The method of producing a tab on a bag flap which consists in applying a narrow line of paste adjacent one edge of a web of paper, making a slit in said web spaced from the edge thereof a distance equal to the desired width of the tab, said slit being inside the paste line, making two slits similar to the first spaced from the other edge of the web, folding the web to form a bag tube so that the first slit coincides with the outer one of the second two slits and severing the tube along a line which meets the ends of the two slits.

5. The method of producing a tab on a bag flap which consists inapplying two narrow lines of paste adjacent one edge of a web of paper, making a slit in said web spaced from the unpasted edge thereof a distance equal to the desired width of the tab, making two slits similar to the first, one of said slits being between the two paste lines and the other slit within the second paste line and spaced from the other slit a. distance equal to the desired width of the tab, folding the web to form a tube so that the first slit coincides with the outer one of the second two slits and severing the bag tube along a line which meets the ends of the slits.

6. The method of producing a reenforced carry bag which consists in making slits in a web of paper at bag length intervals apart along each edge of the web and spaced from the edge of the web a distance equal to the desired width of a tab, simultaneously feeding a reenforcing strip wider than the tab width on top of the web and folding the web to form a bag tube having a central seam equal in width to the width of the tab.

GEORGE W. POPPE. 

